Sabalenka spent eight weeks at the summit last year before Swiatek overtook her with a victory at the season-ending WTA Finals and the Belarusian hopes for a longer stay as 'N1'.
Swiatek said she made far too many mistakes against Keys on Rod Laver Arena and hoped to draw lessons from it.
Iga Swiatek tested positive in an out-of-competition sample in August but the ITIA accepted that it was caused by contamination of her medication melatonin.
Olympic-bound Ravi Dahiya could not take advantage of a tiring Gulomjon Abdullaev in the final after outclassing the same Uzbek wrestler in his opening round and settled for a silver medal at the Poland Open in Warsaw on Wednesday.
The last time the Swiss maestro was this far down in the ATP rankings was all the way back on January 2001, when Federer was just 19 years old. Notably, he was yet to win his first tour title.
Aryna Sabalenka is the red-hot favourite at Melbourne Park, where another victory would give her a fourth major title and widen the gap in the rankings to Poland's Iga Swiatek and Coco Gauff of the United States.
The Dutchman collapsed on the court after converting his sixth match-point to end an absorbing three hour, seven minute affair under sunny skies on Stadium One court.
Coco Gauff was given a solid workout by former champion Sofia Kenin but continued her lengthy winning streak
Iga Swiatek's maiden triumph at the US Open extended her lead to almost twice as many points as the second-ranked Ons Jabeur
Top seed Elise Mertens cruised to victory, but fourth-seeded Nadia Podoroska and fifth-seeded Jacqueline Cristian were not as fortunate in the first round of the Jasmin Open Tunisia
The Swiss star underwent arthroscopic right knee surgeries in February 2020 and May 2020. Federer has played five tournaments since having those surgeries, all of which came this season.
Images from the World Cup qualifying matches played on Wednesday night.
Poland's first-choice goalkeeper Wojciech Szczesny will miss Thursdays Euro 2016 clash with Germany but could return for their final Group C game against Ukraine, coach Adam Nawalka said.
Defending champion Iga Swiatek crushed Dayana Yastremska 6-0, 6-2 and 2023 champion Elena Rybakina powered past Britain's Katie Boulter 6-0, 7-5 to reach the fourth round of Indian Wells on Sunday in displays of dominance.
Novak Djokovic reached the Wimbledon quarter-finals for the 16th time but it proved a hard day's work at his Centre Court office.
Germany suffered their first home defeat in a World Cup qualifier in 20 years
Indian tennis star Sumit Nagal continued his fine form as he entered the quarterfinal of the ongoing Perugia Challenger.
Sinner gives the impression of a player with all the answers against whoever he comes up against, but the off-court questions he is likely to face about the doping case that surfaced in August might be harder to shrug off.
Gauff split from coach Brad Gilbert and flipped the script weeks later, however, winning her second WTA 1000 title last month at the China Open before reaching the Wuhan Open semis.
The two lowest-ranked teams will kick off the World Cup at Luzhniki Stadium in Moscow on June 14.
Already assured of a place in the summit clash, favourites India had to sweat it out before defeating Poland 4-2 in the final round-robin match of the men's hockey Olympic Qualification tournament, in New Delhi on Friday.
Jasmine Paolini put on a tennis masterclass to steer Italy to a fifth Billie Jean King Cup title as she beat Rebecca Sramkova 6-2, 6-1 in the second singles rubber to wrap up a 2-0 win over Slovakia in the final on Wednesday.
Iga Swiatek has been not been at her world-beating best in the months leading up to the U.S. Open but the Pole has both the talent and mentality to lift her game for the final Grand Slam of the year, tennis great Chris Evert said.
Third seed Alexander Zverev eased past home favourite Ugo Humbert
Jannik Sinner is primed for a Wimbledon title tilt after picking up his first grasscourt trophy at Halle
Koneru Humpy's non-participation in the event has not hampered the team's chances much as Vaishali has jumped significantly in rankings and is a force to reckon with in the women's circle.
Top-ranked Iga Swiatek of Poland faces Irina-Camella Begu of Romania in the opening round of the women's draw with second-seeded American Coco Gauff taking on Australian Ajla Tomljanovic.
Dutee rued missing the World Relay Championships in Poland in May and two competitions in Kyrgyzstan and Kazakhstan this month due to travel restrictions
Pole says she feels much better prepared to handle the pressure of her latest career milestone.
Manika Batra led from the front as India prevailed over higher-ranked Romania 3-2 in a thrilling tie
Jannik Sinner has withdrawn from the Paris Games due to tonsillitis.
Swiatek's dominance on clay that the top seed from Poland has won her last 20 matches at Roland Garros, as she bids for a third successive trophy to add to her maiden Grand Slam triumph in Paris four years ago
'Putin will not be bound by any kind of deal he would sign with the US.'
Final positions in the six groups are still up for grabs which determine potential opponents in the knockout stage.
Poles nationwide will hope their team get the Euro 2012 party started with a bang when they take on Greece in the impressive National Stadium in the tournament's opener on Friday (5:00 p.m. British time).
American tennis ace Serena Williams has maintained her No 1 spot, while German Angelique Kerber has slipped to the third in the latest women's tennis world rankings issued by the WTA.
Sarvesh Kushare said Neeraj Chopra's advice has boosted his confidence as at one point in time this year, he was not even sure of making the Paris Games cut.
Manika Batra won both her singles matches as the Indian women's team edged out Hungary 3-2 for its first win of the World Table Tennis Championships in Busan on Sunday.
India rewrote several records and unlocked some new firsts at the Paralympic Games.
India scored a 3-0 victory over Poland to notch their second consecutive victory in the Hockey World League semi-finals, in Antwerp, on Tuesday.
